Socks made by Conscious Step help people, animals and the environment. These are Socks that Protect Koalas raise support and awareness for species facing extinction thanks to Conservation International. Large fits USA Men's 8-13, USA Women’s 9-14. Small fits USA Men’s 4-8, USA Women’s 5-9. The socks are made of 75% Organic Cotton, 23% Polyamide, 2% Spandex and have a seamless toe. Machine wash warm and dry on low heat.